Air-pump



I. F. HENRY- AIR PUMPl APPLICATION FILED JUNE 27.1919.

0. 2 OU .l A1, 2 bl e F d G t 1 in air pumps particularly adapted foratr. rinNRY, ornNsoN'IA, CONNECTICUT.

AIR-PUMP.

Specification of Letters Patent.

Patented Feb. 24, 1920.

Application flied June 27, i919. serial No. 307,223.

To all 'whom t may concern:

Be it known that I, JEREMIAH F. HENRY,v

a citizen of the VUnited States, residing at Ansonia, in the county ofNew Haven and State of Connecticut, have invented a new and usefulImprovement in Air-Pumps; and I do hereby declare the following, whentaken in connection with the accompanying drawings and the characters ofreference marked thereon, to be a full, clear, and exact description ofthe same, and which said drawings constitute part of this application,and represent, in

Figure 1 a face view offan air pump constructed in accordance with myinvention.

Fig. 2 a side view of the same, partly broken away.

Fig. 3 a sectional view of one of the pistons. f p

Fig. 4 a broken sectional view showing the outlet from one of thecylinders. Y

Fig. 5 a broken sectional view of the driving gears, driving shaft, andmeans for connecting the driving gears with the driving` shaft. A

This invention relates to an improvement tachment to the ruiming boardsof automobiles for use in connection with inflating tiresthe objectbeing a simple arrangement of parts whereby the tires may be fullyinflated with a minimum degree of expenditure of force; and theinvention consists in the construction hereinafter described andparticularly recited in the claim.v

In carrying out my invention, I employ a casing 10 Vsecuredl to ormounted upon a base 11 formed with a clamping arm 12 carrying a clampingscrew 13 by which the device may be clamped to the running-board.

of an automobile or other convenient point.'V IVithin the casing are twocylinders 14 and 15 which open at the bottom into a transverse passage16 in the base which YLopens into a centrally arranged port 17 providedat its outer end withl a nipple 18 to which a pump tube may be attachedvin the usual manner. Between the cylinders and the passage 16 are checkvalves 19. In the cylinder 14 is a piston 20 and in the cylinder 15 isarpiston 21. 4Connected with the bottoni of each piston is a cup-shapedleather packing 22 secured in place by a nut 23, and an externallythreaded tubular stem 24 which contains a valve 25 normally held in theclosed position by a spring 26. piston 20 is connected by a piston rod27 with a crank arm 28 on a shaft 29 mounted in the casing, and keyed tothis shaft 29 are diiferential'gears 30 and 31. The piston 21 isconnected by a piston rod 32 with a crank armV 33 on a shaft 34 which ismounted in the casing parallel with the shaft 29, and on this shaft arekeyed differential gears 35 and 36. Mounted in the casing above theshafts 29 and 34 and centrally in line between them, is a shaft 37 onwhich are loosely mounted a gear 38 meshing with the gears 30 and 35,and also a larger gear 39 meshing with the gears 31 and 36. Connectedwith the shaft 37 is a crank handle 40 by which the shaft may be turned,and extending through the shaft 37 is a lpin 41 carrying a key 42 whichmay be engaged with either of the gears 38 or 39 and so that the turningofthe shaft 37 will move one or the other of the said gears. If the key42 is engaged withl the gear 38, this gear will turn the large gears 30and 35 and thus rapidly move the piston rods 27 and 32 so asV to -movethe pistons 14 and 21. in their cylinders, it being noted that the`crank arms 28 and 33 extend in opposite directions so that when onepiston is moved down, the other piston will be moved up, the downwardmovement of the piston discharging air through the nipple 18 and thepump tube, not shown. When more power is required, as in completing thepumping operation, the key 42 will be moved .out-` ward so as to engagewith the gear 39 which is a larger gear, land meshing with the smallergears 31 and 36, will give increased power to the movement of thepistons.

An air pump comprising a casing, two

lcylinders mounted side by Vside therein andv connected with a singleoutlet, a piston in each cylinder, a piston rod connected with 10o Y Theing shaft, a crank on said driving shaft, In testimony whereof, I havesigned this differential gears on said driving shaft and specificationin the presence of two sub,- meshing with said crank gears, a pin eX-scribng Witnesses.

tending tin-(nigh the driving shaft, and n r ,JEREM1AH'F-HENRYI- 5 keycarried by said pin and adapted t0 Witnesses: i

couple either of the driving gears with the CHARLES J. OCONNELL,V

driving shaft. WILLIAM H. MORGAN.

